不同水分含量的玉米淀粉颗粒的结晶度

淀粉是目前使用比较广泛的一类可生物降解的多糖类天然高分子，具有材料来源广、低廉和易生物降解等优点，在生物降解材料领域占有重要的地位。但缺点就是是含淀粉的降解塑料耐水性都不好，湿强度差，一遇水其性能则会减低。那不同水分含量对玉米淀粉颗粒的结晶度是怎样的？

Starch is a kind of biodegradable polysaccharide natural polymer widely used at present, which has the advantages of wide source, low price and easy biodegradation. It plays an important role in the field of biodegradable materials. However, the disadvantage is that the degradable plastic containing starch has poor water resistance, poor wet strength, and its performance will be reduced in case of water. What is the crystallinity of corn starch granules with different water content?

应用X-射线衍射方法对不同水分含量的玉米淀粉颗粒的结晶度进行了研究。只有在玻璃态情况下,淀粉的无定型区域才产生X-射线衍射图样,衍射峰的强度、面积在某种程度上依赖于淀粉的含水量。

The crystallinity of corn starch granules with different moisture content was studied by X - ray diffraction. Only in the case of glass state, the amorphous area of starch can produce X-ray diffraction patterns, and the intensity and area of the diffraction peak depend to some extent on the water content of starch.

玉米淀粉颗粒的X-射线衍射图形是由两部分组成的:微晶区域和无定型区域。随着水分含量的增加,样品的结晶度从小到大,并达到一个平衡值(约45%)。

The X-ray diffraction pattern of corn starch granules is composed of two parts: microcrystalline area and amorphous area. With the increase of water content, the crystallinity of the sample increases from small to large, and reaches an equilibrium value (about 45%).

室温下,当水分含量处于低水平时(小于11.25%),玉米淀粉颗粒中的无定型区域处于玻璃态,衍射图形显示的是微晶区域和无定型区域两部分的衍射图形的综合。

At room temperature, when the water content is low (less than 11.25%), the amorphous region in the corn starch granules is in the glass state, and the diffraction pattern shows the synthesis of the diffraction patterns of the microcrystalline region and the amorphous region.

当水分含量处于较高水平时(大于18.55%),淀粉颗粒中的无定型区域处于橡胶态,其X-射线衍射图形仅由微晶区域形成。在较低水分含量时，由于塑化做作用下增大含水量会导致更多微晶的形成。

When the water content is at a high level (more than 18.55%), the amorphous region in the starch granules is in the rubber state, and its X-ray diffraction pattern is formed only by the microcrystalline region. When the water content is low, increasing the water content due to plasticization will lead to the formation of more microcrystals.

关于不同水分含量的玉米淀粉颗粒的结晶度这个问题的了解就到这里了，您对此有什么问题要咨询的话欢迎来我们网站https://www.qiluxinke.com进行了解！

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